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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Common Stock Warrants | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Accumulated Earnings
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2017 | $ 342,746 | $ 689 | $ 9,082 | $ 427,091 | $ (814,732) | $ (28,822) | $ 749,438
Balance, beginning of period (Cumulative Effect, Period of Adoption, Adjustment) at Dec. 31, 2017 | $ 7,562 |  |  |  |  |  | 7,562
Balance, beginning of period, shares at Dec. 31, 2017 |  | 33,516 |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201409Member |  |  |  |  |  |
Net income | $ 66,130 |  |  |  |  |  | 66,130
Unrealized gain on short-term investments, net of tax | 90 |  |  |  |  | 90 |
Foreign currency translation adjustments | (14,203) |  |  |  |  | (14,203) |
Total comprehensive income | 52,017 |  |  |  |  |  |
Repurchase of common stock | (34,967) |  |  | (7,339) | (27,628) |  |
Repurchase of common stock, shares |  | (862) |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 2,311 |  |  | 2,311 |  |  |
Issuance of common stock pursuant to employee stock purchase plan, shares |  | 71 |  |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans |  | $ 5 |  | (5) |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans, shares |  | 553 |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans |  | $ (1) |  | 1 |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares |  | (120) |  |  |  |  |
Stock-based compensation expense | 19,358 |  |  | 19,358 |  |  |
Dividends | (28,003) |  |  |  |  |  | (28,003)
Balance, ending of period at Dec. 31, 2018 | $ 361,024 | $ 693 | 9,082 | 441,417 | (842,360) | (42,935) | 795,127
Balance, ending of period, shares at Dec. 31, 2018 |  | 33,158 |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |
Net income | $ 82,770 |  |  |  |  |  | 82,770
Unrealized gain on short-term investments, net of tax | 14 |  |  |  |  | 14 |
Foreign currency translation adjustments | 3,418 |  |  |  |  | 3,418 |
Total comprehensive income | 86,202 |  |  |  |  |  |
Repurchase of common stock | (30,525) |  |  | (5,068) | (25,457) |  |
Repurchase of common stock, shares |  | (693) |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 2,227 |  |  | 2,227 |  |  |
Issuance of common stock pursuant to employee stock purchase plan, shares |  | 55 |  |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans |  | $ 4 |  | (4) |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans, shares |  | 513 |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans |  | $ (1) |  | 1 |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares |  | (142) |  |  |  |  |
Stock-based compensation expense | 19,919 |  |  | 19,919 |  |  |
Exercise of Comcast stock warrants | (12,911) |  | $ (9,082) | (3,829) |  |  |
Dividends | (29,274) |  |  |  |  |  | (29,274)
Balance, ending of period at Dec. 31, 2019 | $ 396,662 | $ 696 |  | 454,663 | (867,817) | (39,503) | 848,623
Balance, ending of period, shares at Dec. 31, 2019 | 32,891 | 32,891 |  |  |  |  |
Net income | $ 58,711 |  |  |  |  |  | 58,711
Unrealized gain on short-term investments, net of tax | (3) |  |  |  |  | (3) |
Foreign currency translation adjustments | 8,368 |  |  |  |  | 8,368 |
Total comprehensive income | 67,076 |  |  |  |  |  |
Repurchase of common stock | (38,168) |  |  | (11,859) | (26,309) |  |
Repurchase of common stock, shares |  | (878) |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 2,523 |  |  | 2,523 |  |  |
Issuance of common stock pursuant to employee stock purchase plan, shares |  | 68 |  |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans |  | $ 7 |  | (7) |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans, shares |  | 672 |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans | (3) | $ (3) |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares |  | (40) |  |  |  |  |
Stock-based compensation expense | 25,237 |  |  | 25,237 |  |  |
Dividends | (30,932) |  |  |  |  |  | (30,932)
Balance, ending of period at Dec. 31, 2020 | $ 422,395 | $ 700 |  | $ 470,557 | $ (894,126) | $ (31,138) | $ 876,402
Balance, ending of period, shares at Dec. 31, 2020 | 32,713 | 32,713 |  |  |  |  |

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